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| PubMed | |
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Article by Liu, J. |
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Article by Ma, L. T. |
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Article by Peng, L. |
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Article by Chen, Y. Q. |
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Article by Zhang, L. |
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Article by Fan, J. J. |
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Article by Yan, D. F. |
���౦��ɽ�����٪��ͳҤ���鷢�ִĿ���ֲ�ﻯʯ��ͨ�������ⲿ��̬�ͱ�Ƥ�����о����϶�Ϊʯ�մĿ�Ҷ (Czekanowskia (Vachrameevia) shiguaiensis)���Աȵ�ǰ��ʯ�����ִ������Ӧ�� (the nearest living equivalent species) —Ginkgo biloba L�� �����ױ��ʣ��õ�����ɽ�������٪�����ĹŴ��� CO2 �������Ϊ 1. 55 ×10��3 ����ֵ�ӽ� GEOCA��B ��̼ƽ��ģ�͵�������ߣ������Ŀ�Ҷ��ֲ��Ҳ�ǻָ��Ŵ��� CO2 ������������ò��ϡ�ͬʱ��ͨ�����ʲ��������йŻ����ؽ��������������ɽ�������٪����ʱ�������Ϊ�º�ʪ��
Czekanowskialean fossils are discovered from the Middle Jurassic Yaojie Formation in the Baojishan Basin��Gansu�� They are assigned to Czekanowskia (Vachrameevia) shiguaiensis Sun et al�� according to the leaf morphology and epidermal structures��Compared the stomatal ratio between the fossil and the nearest living equivalent species--Ginkgo biloba L., the value of CO2 concentration in the Middle Jurassic Baojishan Basin was deduced as about 1. 55×0��3 ��which is closer to fitted curve of the GEOCA��B �� carbon balance model�� It shows that Czekanowskia (Vachrameevia) shiguaiensis might be a good fossil plant for reconstructing paleoatmospheric CO2 level�� The results indicate that the climate of Baojishan Basin was warm and wet in the Middle Jurassic��